
When this creature diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., create a 3/3 blue Fish creature token with "When this token diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., create a 6/6 blue Whale creature token with 'When this token diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., create a 9/9 blue Kraken creature token.'"
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.